Compressor



s sneet-sneet 2 H. c. HELLER COMPRESSOR v Filed .my 2a, 1934 April 1,2, 1938.-

- April 12, 1938. H. c. HELLER 42,113,691

COMPRESSOR lFiled July28, 1954 6 Sheets-Sheet 3 A 'ZNEY April l2, 1938. H. c. Pls-:LLEA

COMPRESSOR Filed July 28, 1934 6 Sheets-Sheet 5 [NVENTR H.C. Heller 'April 1`2, `193s. H. c. HELLER 2,113,691

y COMPRESSOR l Filed .July 2e, 1934 6 sheets-sheet 6 l N VEN TOR H. C.. Hel/l* Patented pr. 12,' 1938 COMPRESSOR Henry C. Heller, Collingdale, Pa., assigner to Baldwin-Southwark Corporation, a corporation of Delaware Application july 2s, v1934, serial No. 137,426

17 Claims.

This invention relates generally to compressors and more particularly to a hermetically sealed motor-compressor unit especially adapted for refrigeratihg purposes.

Many attempts heretofore have been made to provide' simple and elective motor-compressor units of the sealed type but the same have been suitable primarily only forsmalldomestc household refrigerators, it being understood that the present invention is particularly adapted for air conditioning purposes such as room 'coolers or for railway air conditioning thus requiring relatively large horsepower together with'quiet operation, ruggedness and dependability and cornpar-atively light weight.` l

One object of my invention is to provide a relatively simple and durable sealed type motorcompressor unit of the reciprocating piston type, which is so constructed and arranged that the unit will operate with a high degree of smoothness and quietness while at the same time the parts may be economically manufactured and assembled in quantity production without sacriilcing any of the fine qualities which are far cylinder head in combination with intake and-` discharge valve mechanisms and yieldable-means for holding the liner and valve assembly in position in the casing, whereby the cylinder head may be readily removed and access had to the valve and liner assembly; A further object in this respectis to provide an improved con'struc- Other objects have to do with the provision of more essential in an air conditioning unit of the Aimproved lubrication means including supply and return passages and an oil circulating pump; improved means for supporting the oil pump 55 so that it may befassembled in aA simple and effective manner and yet will be as free as possible irom abnormal strains; an improved main compressor or cylinder frame having its parts so constructed and interrelated that it maybe effectively integrally formed to provide a very vsimple and yet highly rugged frame for supporting such elements as the crankshaft,.motor and other members, an improved cylinder liner and suction passages'therefor; and an improved unloader supported in an improved manner by the main compressor housing to provide a simple and still a very durable and rigid construction.

Other objects and advantages will be more apparent to those(skilled in the art from the following description of the accompanying drawings in which:

Fig. 1 is a vertical section of one form of my improved motor-compressor unit;

Fig. 2 is a horizontal sectional view of the compresser frame taken substantially on line 2 2 of Fig. 3, with the various operating 'elements omitted for sake of clarity;

Fig. 3 is an enlarged vertical section of the compressor frame similar to that shown in Fig. 1 but with operating elements omitted to show certain passages more clearly;

Fig. 4 is a fragmentary vertical section taken substantially on the line '4-4 of Fig. 3 to show details ,of construction of the unloader and its relation to the compressor structure;'

Fig. 5 is a horizontal section taken on the line 55 of Fig. 4; Y

Fig. 6 shows a modified arrangement for covering the handhole in the compressor frame; i

Fig. 7 is a modified form of motor-compressor unit;

Fig. 8 is a horizontal sectional view taken substantially on the line 8-8 of Fig. 9 looking up- 'wardly and showing one piston and connecting rod in section and the other in elevation;

Fig. 9 is a vertical section of another modified form of motor-compressor unit;

Fig. 10 shows a modiied arrangement of oildeeotingmeans.A

vIn the illustrated embodiments of the invention which are shown herein merely for the purpose of disclosing certain specific forms among possible others that the invention might take, I have provldedas shown in-Flg. 1 a cast compressor frame generally indicated at II of substantially straight cylindrical forni throughout its length which extendsfrom the lower edge I2 to anv upper edge ll. An upper, bearing or-gulde I l is'supported by a preferably slightly inclined crown or conical disc-like member IQ- extending inwardly from the upper portion of the compressor frame. A lower bearing support or guide I is supported by a pair of ribs I1 and |3 extending 'preferably slightly downwardly from a lower portion of the compressor frame. A

l pair of cylinder housings 20 and 2| preferably I5, while the lower portion 24 of cylinder' 2| similarly merges with rib I8, thereby effecting a disposed on opposite sides of a lcrankshaft 22 project inwardly-`from the cylindrical wall of the compressor frame, it being noted that the upper portion23 of cylinder housing2|l substantially merges with the upper radial support or crown' mutual reinforcingrelation between the cylinder housings and the radial supports for the bearing guides. Projecting outwardly from the wall of the compressor frame and in axial alignment with the cylinder housings 2|| and 2| are housings 25 and 25 preferably of circular cross-section, these housings providing chambers 21 and 2B Vadapted to perform multiple functions for housing the valve mechanism, of providing a chamber for a safety mechanism and of providing a discharge chamber. After the valve and safety elements, which will be described later, are assembled with the compressor frame; said chambers 2 1 and 28.are closed by ilat disc end covers 29 and 30 and are peripherally welded at 3| and 32 to the housings 3l and 25.' It will be noted in accomplishing this improved and simple welded cylinder head construction that .the chamber housings 25 and 25 are in the nature of a cantilever by nature of extending freely for an ap-l preciable distance outwardly from the cylindrical wall of the compressor frame, thereby permitting ample opportunity for the elongated housings 2b and 26 to compensate for any distrtional eects created by the welding heat. These dlstortionaleects of the welding heat are prevented from being transmitted to the compressor frame. and accordingly bearing guides Il and I5 are main- .tained in their true axial alignment. In addition to this result, there is the further desirable fea ture as above mentioned of providing a relatively simple and effective chamber for performs ing several functions.

The cylinder housings 2|! and 2| are eachl provided with liner supporting walls 35 and 35 (corresponding primed numbers being used for cylin- .der 2|) having an annular inlet recessA 31- therebetween. As shown in Figs. 2 and 3, these annular recesses areinterconnected by a suction passage 38 formed around the inner wall of the compressor frame. .This interconnecting passage communicates as at 39 near the top of the ani .nular recess' 31' and at with the lower side of Asuitable oil drainage and axial peripheral slots 49.

annular recess 31. This constructionmaterially adds to `the-strength of the circular walls and other parts of the compressor.- A suction inlet II extends through the compressor frame for communication with passage 33.

'I'he remaining elements of the compressor will beY described-in the order of their assembly .to.

geth'er with certain further detailed features of construction employed in the compressor frame. 'I'he electric motor generally indicated at AIl and preferably of the induction type has its stator l5 press-ntted in a.` machined portion 45 and seated against a suitablestop' flange l1. The neld; windings Il project from each end of the core 'of stator 4 5, and this core is also provided with cooling openings or Th'ecrankshaft 32 has two .crank 53 and 5| supported by alower stub journal 52 v and an upper elongated journal 53. The crankshaft, before being inserted in the compressor, is assembled with a bearing 55 preferably but not necessarily made of cast iron with the bearing surface suitably ground or polished. This bearing has an arrestor ring 55 surrounding an oil collector groove`5'l. An annular recess 58 is formed in bearing 55 to provide an oil reservoir 'as well as to provide Vproper contacting surface between the bearing and the guide '14. A collar 53 is next pressed on to the compressor shaft against a shoulder III thereof. The rotor 5I is then pressed or otherwisesuitably keyed or secured to theI crankshaft. The foregoing comprises the Acrankshaftassembly which is 'thereupon inserted within the compressor frame. Any suitable number of bolts B2 are inserted through suitable lugs 62a formed on guide Il-for threaded engagement withg ears such as B2b formed on the upper portion of bearing 55 to draw the same downwardly tightly against the guide Il. The bolts 52 may be reached by a wrench through the spaces between the supportingribs I'l and I5.

An oil pump and bearingassembly comprises a lower bearing 8l assembled within guide I8 by being inserted upwardly therein until a flange 55 engages the lower edge of guide I5.' Thereupon stud bolts 52e extend upwardly through ears 62d. formed on bearing 54 and into threaded engagement with guidev I5. An annular groove 65 formed in bearing vM provides an oil passageY and also. provides proper supporting contact between the bearing and guide. An oil pump generally indicated at l1 may be of any suitable l rotary or piston type, but is herein shown preferably as of the gear type whose casing issecured to the bearing 5I by bolts 6l. A driving connec-j tion is provided between crankshaft 22 and the Vgear pump, this connection comprising /a pump shaft 55' having a dat portion axially'insertable in a transverse slot in the lower end of the crankshaft. An oil strainer generally indicated at 1|` ofl any suitable type is carried by the oil pump through' an elbownipple 12 connected intothe inlet of the pump. The vpump and filter elements are -secured tobearing 81 before thelower end of the compressor frame is closed, in a manner to be described shortly.

The next assembling steplis to make up the piston and cylinder liner sub-assembly comprising a cylinder liner I5 having an enlarged flanged end I5 and an annular recess 11 for cooperation with groove 31 or 31 in the cylinder housing.

A piston 'Il has a preferably concave head 55 to receive a convex valve seat member Il. thereby reducing cylinder clearance to a The piston, connecting rod 'I9 and liners 15, are assembled as a sub-assembly and inserted inwardly through chambers 21 and 2l so that the liner Y flanges I5 engage the bottom of said chambers,

and the spaced annular surfaces of the liners are seatedv against surfaces 35 and 35 and 35" and 35'.. The c'ap ends 52 and 52' of the connectingV rodsare 'thensecured to the connecting rods by usual bolts such as-'. These bolts are accessible, Fig. 2, through a laterally disposed hand op frame opposite'to the suction e 33. the

v Y being accessible througnsgidhand holle.J

After the twopistons or as many as there are cylinders are connected to the crank- -shaft, then 'the plate valve mechanism generally indicated at 35 is seateddn a suitable recess l1 formed m um ranged .end n. demis er ening 'l5 formed in the side wall of the compressor v construction of the valve mechanism per se do not constitute a part of my present'invention. It will be pointed out, however, that the annular plate discharge valveis generally indicated at 88 and an annular plate intake valve is gen- -era1ly indicated at 89, the cages and retainers for the valves being suitably secured together to formr the valve unit.85. A spring is then inserted over a central stud 9| and against the valve mechanism to hold the samein recess 81.

The closure plate or cylinder head cover 29 is upon occurrence of abnormal cylinder pressure to relieve the same without injury to the compressor mechanism. The construction and assembly of the various elements for the two cylinders is identical and hence the description for one cylinder will sufilce for both. The liner is provided witha series of axially extending intake portsv 92 adapted to communicate with the cyli-nder through the intake valve mechanism 89. A series of radial ports 93 are uncovered by the piston near the end of the piston stroke, thereby to permit admission of additional gas. These ports are substantially immediately recovered upon the return stroke of the piston", and it will be also noted that the piston as shown in Fig. 1 over-rides to a substantial extent the plane containing platevalve 89.

Unloader mechanism.-Preferably the unloader mechanism is next assembled in the compressor casing as shown in Figs; 3, 4, and 5, although as will be seen later the unloader may be assembled even after the motor-compressor unit is completely sealed. 'Ihe unloader comprises a housing |00 projecting inwardly from the compressor frame and beneath the walls of passage 38. The lower portion of theunloader housing projects inwardly in the form of a rib |0| to bearing guide I8, thereby effecting a high degree of mutual supporting relation between the various parts of the compressor frame in addition to permitting the functions of such parts to be performed in a simple and efficient manner. 'I'he unloader is moved to its loading position by oil pressure created by lubricant pump 81 and is moved to its unloading position preferably by a spring when the pressure falls upon stopping of the compres- 'I'he oil pressure is transmitted from annular recess 55, Fig. 1, through a ,passage 02, Fig. 4, thence upwardly through a passage |03 formed by drillingentirely through rib |0I, the lower end of such passage being closed by a plug |04. The oil pressurev transmitted through passage |03. moves an unloader piston against the tension of a spring |08. The inner end of cylinder |01 in,l which piston |05 is disposed is vented tol .the crankcase as through a port |00. `When the compressor is running so that vpump pressure moves piston |05 inwardly against spring |06, then an unloader valve |00 is moved inwardly by a spring ||0 to close a passage Valve |09 is guided in passage by a fluted lportion ||2 of a valve stem ||3 lformed integrally with valve |09. 'I'he valve stem ||3 in turn is guided in a piston head ||4 held in position by a closure plug |`|5 in which the unloader valve |09 is disposed.- The plug' ||5 is preferably threadedly secured as at ||6 in an enlarged bore and has transverse slots 1 at its lower endto allow communication between a chamber ||8 and a passage ||9 for bypassing the high pressure side -of the compressor directly to the interior of the 'motor-compressor unit, specically into the compressor crankcase or frame. Any suitable point of the high pressure side of thercompressor is connected by a pipe too a stepped bore |2| .in which unloader valve |09 is disposed. A, ported plug |22 provides an abutment for spring ||0, said plug Vlbeing helzf in position in any suitable manner specically by a transverse pin |23.

Briefly the operation of the unloader mechanism is that upon starting of the compressor, oil pressure is built 'up by pump 51 and transy-mitted from recess 66, Fig. 1, through passages |02 'and |03 to @piston |05, .the outer end of passage |02 leading to an oil cooling coil which returns cooled oil to the compressor crankcase. As the oil pressure moves piston |05 to the right, unloader valve |09 closes thereby preventing bypassing of high pressure gas-from the compressor discharge line |20 through opening and npassages ||0 and ||9 to the compressor crankcase. However, when the compressorcis stopped, the oil pressure drops thereby permitting spring |06 to move piston |05 and valve stem ||3 outwardly and accordingly unseat unloader valve |09, whereupon the high pressure side of the compressor discharges into the compressor crankcase to. equalize the pressure on each side of the pistons, thus permitting the compressor to subsequently ystart under minimum load. Upon starting of the'compressor, the ecrankease pressure is reduced by reason of ports |24, Fig. 1, formed in the cylinder liner periphery, allowing refrigerant gas in the crankcase tobe drawn into the cylinders through 11 and 92.

To 'regulate the degree of oil pressure, a relief valve |25, Fig. 5, yieldably maintains a bypass port |26 closed. Hence when the pressure in passage |02 has reached a predetermined value. valve |25 vis moved outwardly to bypass excess oil back to the crankcase through port |21. 'The tension of the spring may be adjusted by. a screw plug |28 suitably hermetically sealed by solder or the like. f

End closures for compressor frame.-The lower end of compressor frame is provided with a preferably pressed or forged metal housing suction ports and passages suitably circumferentially welded as at |3| to the lower end of the compressor frame Similarly a top closure member |32 preferably formed of pressed or forged metal such as steel or the .like is circumferentially weldedv as at |33 to the side of bearing 52 of the crankshaft thus providing a liquid thrust bearing for the shaft. Oil from chamber |31 ows to annular chamber 65 and thence inwardly through a port |38 to lubricate bearing 52 and flows out through passage 02 to a suitable oil cooling coil (not shown) and thence to a passage |02, Fig. 3, which extends 75 through the crowned bearing guide support I5 and bearing I4. thus to supply oil to annular chamber 55. The oil passes therefrom through drilled passages. |35 in crankshaft 22 to lubricate the connecting rod bearings and also the upper crankshaft bearing 53. Excess oil flows upwardly through passage |45, disposed axially of the crankshaft. and discharges through a reduced nozzle pening |4| formed preferably ln a removable plug |42. A sheet metal deeotor |43 of any suitable shape is clamped by plug |42 on the upper end of the crankshaft so as to rotate therewith. Oil flows through 'opening |4| and over the conical deflector to be thrown outwardly against an annular flange |44 depending from and secured to the top'cover |32, although it will of course be understood that such a flange may be formed in any suitable manner on said cover.

' The oil striking flange |44 will drip downwardly over a portion. of the field coils 45 to cool the same and thence fiowdownwardly through axial oil slots .45 formed in the periphery of the. held core 45 to accumulate around the outer portion of the conicalpartition |5. An opening |45 formed in this vpartition permits the oil to drain" dow,n past the radial ribs |1 and I5 into the sump.

In the modification. shown in Fig. 10,1the'oll deector A|43'is dispensed with and in place thereof a plug |42' extends upwardly to near the top of cover |52 to discharge laterally `on a stationary defiector |45 secured to and depending from the top of cover |32 so that the outer cirj cular edge of the dellector allows oil to drip down either over the field coils 45 or past the same and drip more directly into the oil slots 45` if so desired. Itwill be noted that the circular edge of deector |45 is preferably curved slightly downwardly so as to prevent oil from flowing inwardly along the under surface of the ,deflecton If any appreciable quantity of oil should iiow along the under surface of the deector and drip on y to the armature, this oil would ultimately flowl through the air gap'between the armature and stator thus reducing the motor efficiency.

'After the motor-compressor unit is completely assembled as above described, the hand hole opening 55, Fig. 2, is then closed. As shown in Fig. 2, my improved hand hole is constructed and arranged to permit a preferably disc-like cover |55 to be effectively welded to the compressor frame, it being noted that a circular projection |5| extends outwardly from opening 55. Hence fupon circumferentially welding coveri55 to the circular wall |5|. as at |52, any-stresses set up due to the welding heat will not stort the corn-- presser frame. The radial length of the circular wall |5 will depend upon the size of the compresser.' thickness of walls or the like but in general the longer the circular wall |5| can be Imade, the lessA danger there is of transmittingh any internal strains to the compressor frame.' vlt is found in general that a circular wallof two or three4 inches in.l lengthis suilicient for a the openlng`85, which preferably isvclrcular. I'he plate |53 and compressor frameare welded as at |54.v

the crankshaft bearing.

MOdicaton of Fig'. 'L -This m'odihcation vcornprises a cast compressor' frame |55 having an inwardly projecting cylinder housing |5| to receive a cylinder liner |52 and valve'mechanism |53of the same general type and arrangement as shown in Fig. l1. However, the cylinder head |54 is se' cured by bolts |55 to the compressor frame, it being noted that said cover also clamps the flangeportion |55 of liner. |52 against the compressor frame. The valve mechanism is heldby a spring |51. 'Ijhe central portie of the compressor frame has its diameter somew t reduced from that of *Y the upper and lower ends of theframe indicated respectively at |55 and |55. As a result of'this arrangement, the .lower and upper cover plates and '|1I may be made identical in construction and'size. The upper cover is circumferenvtially welded as at |12 to aicircular motor shell or housing |13. `this in turn being circumferentially welded as at |14 tothe upper' end |55 of the coml pressor f ame. It Awillgbe noted that cover |1| slightly o erlaps' the lower end'of motor stator l |15, thereby facilitating alignment of the various parts. Wires for the motor ield` are led through a hermetically sealed plug |15 located preferably in arecess |11 formed by the ribs for supporting.v

. As shown in Fig. v8, av hand hole opening |15 may be utilized to house a safety valve |15 instead of the safety disc |35 of Fig. 1. The valve mechanism |15l is supported in a,cl'osure -coverl |55 bolted to a flange surrounding the hand hole opening |15. Other features of the Fig. '1 modification are similar tothose previously described 'for the Fig. 1 form. gj 1 Fia. `9 modifcationfl-The compressor frame generally indicatedatl has a substantially uniform small diameter-,tto the lower end of which a relatively small diamter cover |55 is circumferentially welded as at |51. Cover |55 is pressed or forged as described for the various other covers for the other modifications. The upper end of the compressor frame is provided with a flange |55 on which ,is welded a ring |55 as at |55. 'A

" motor shell |5|ls welded as at |52- to said ring las while an outer shelf m is thereafter welded Yas at |54 to said ring. annular space |55 is thusprovided between inner and outer shells Y bearings 255 and 25| are secured in substantially solid partitions`252-and l253 except for the oil drainage openings therethrough. Excess oil is pumped through passages 254, 255, 255, and 251 to the space |55, therebyto assist in cooling the modifications, it is seenthat I have provided an extremely compact, durable and yet lsimple* her'- metlcally sealedmotor-compresso unit in' which the various parts are-coordinated to eect mutual supporting and functional relationswithout in.

any way dlminishingthe efciency of the structure or operation. i

It will of course be understood that various l changes in. details of construction and arrangement of parts may be made by those skilled in the art without departing from the spirit of the invention as set forth in the appended claims.

I claim:

i. A motor-compressor unit of the crankshaft,

and having a relatively long end freely project-- ing beyond the end of one of said supporting means and a relatively short end of the crankshaft terminating adjacent the other ofsaid supporting means, an electric motor having its armature secured to said free `end of the crankshaft and a stator whose torque is resisted by said wall, a removable bearing carried by and secured to one of said bearing supporting means for journalling the short end of said crankshaft. and. an oil pump secured to and depending from said removable bearing and driven by the short end of the crankshaft.

2. A motor-compressor unit of the crankshaft and piston-cylinder type, comprising a cast compressor frame having a wall extending axially of the crankshaft end encircling the same, axially spaced radial bearing supports formed integrally with said wall andprojecting inwardly thereof, and a plurality of cylinder housings each disposed between said supports and certain of which are formed integrally with one of said supports and certain of which are formed integrally with 'the other support.

3. The combination set forth in claim 2 further characterized in that said cylinder housings are axially offset from each other.

4. A motor-compressor unit of the crankshaft and piston-cylinder type, comprising a cast compressorframehaving a wall extending axially of the crankshaft and encircling the same, axially offset cylinders formed integrally with said wall, and a suction passage formed integrally with said wall in a circumferentialV direction around the inner side thereof and also being formed integrally with said cylinders, said passage merging with one of said cylinders at its lower portion and merging with another of said cylinders at its upper portion.

5. A motor-compressonunit of the crankshaft and piston-cylinder type, comprising a cast compressor frame havlnga wall extending axially of the crankshaft and encircling the same, a cylinder'housing formed integrally with said wall, a suction recess formed on the inside of said housing, a cylinder liner insertable within said hous' ing, valve controlled passages allowing communication between ysaid recess and the interior of said cylinder liner, and axially extending peripheral slots in the outer wall of said liner permitting communication between said recess and the interior of the compressor frame.

6. A motor-compressor unit of the crankshaft and piston-cylinder type, comprising a cast compressor frame having a wall extending axially of the crankshaft and encircling the same, a cylinder housing formed integrally with said wall, a suction recess formed on the inside of said housing, a cylinder liner insertable within said'housing, axially extending inlet passages formed in the wall of said liner. and valve mechanism for controlling communication between said passages and the interior of said liner.

A'7. A motor-compressor unit of the crankshaft and piston-cylinder type, comprising a cast compressor frame having a wall extending axially of the crankshaft and encircling the same, a cylinder housing formed integrally with saidwall, a

suction recess formed on the inside of said housing, a cylinder liner insertable within said housing, valve controlled passages allowing communication between said recess and the interior ofv said cylinder liner, and piston controlled radial ports from said recess to the interior of the cylinder liner. y

8. A motor-compressor unit of the crankshaft and piston-cylinder type, comprising a cast compressor frame having a wall extending axially of the crankshaft and encircling the same and terminating in an outer end; a. pair of bearing supports projecting radially inwardly from said wall and integral therewith; a crankshaft assemblyr including `a bearing axially insertable into one of said bearing supports from said outer end of the compressor frame; a bearing insertable through the other end of said frame and assembled with the4 other of said supports to journal the crankshaft therein; a motor stator in axial alignment with said wall, and means f or operatively supporting said stator by the outer end of said wall in alignment with the` axis thereof and independently of said bearing supports.

9. A motor-compressor unit of the crankshaft and piston-cylinder type comprising an integrally formed compressor frame' having a wall extending axially of the crankshaft and encircling the same, a pair of bearing supports projecting radially inwardly from said wall and integral therewith, said crankshaft being insertable through one. of'said supports, a pair of bearings one being axially insertable into one of said supportsand the other into the other of said supports for journalling the crankshaft therein, a motor stator in axial alignment with said wall and operatively supported thereby outside of said supports tion away from both of said supports, an armature secured to said crankshaft, and a lubricating pump dependently supported entirely by the latter bearing. 10. A motor-compressor unit of the crankshaft and piston-cylinder. type, comprising a cast compressor frame having a wall extending axially of the crankshaft and encircling the same, said'wall forming the outermost wall of the unit, a cylinder cast integrally with said wall and projecting inwardly thereof, and a valve chamber housing disposed axially of .said cylinder and having its base cast integrally with said wall, said housing projecting freely outwardly from said wall in the form of a cantilever.

11. 'I'he combination set 'forth in claim l0 furyther characterized in that a disc head is circum- 'insertable within said cylinder through said chamber, a valve cage and, mechanism mounted on the outer end of said cylinder liner,and a spring interposed between said valve cage and chamber head for normally holding said liner and valve cage in immovable position.

13. The combination set forth in claim 10 -further characterized by the provision of a head se- 5 cured 'to the chamber housing, a cylinder liner of bearing supports projecting radially inwardly 5 linsertable within said cylinder through said from said wall and integral therewith, a crankchamber, a valve cage and mechanism mounted shaft having a throw arm which is bodily inserton the outer end of said cylinder liner, a spring able through one otfsaid supports, a'removable interposedbetween said valve cage and chamber crankshaft bearing in' said support through which l head for normally holding said liner and valve said crankshaft is inserted, a bearing in the 10 cage in immovable position, and means forming other of said supports for also journalling said a discharge outletfrom said chamber. crankshaft with the crank throw disposed mail? 14. A motor-compressor unit comprising an inbetween said bearing supports, a motor stator in tegral compressor frame having an axially exv axial alignment with saidwall, means for operl tending wall which completely encircles the com- `atively supporting said stator 'by said frame in l5 pressor axis, a cylinder formed integrally with dependently of said bearing supports, an arma-v said wall and extending radially thereof, a pair ture secured to said crankshaft, and a lower cup- `of bearing supports projecting radially inwardly shaped enclosure member seated upon and cir-l from said wall and integral therewith, a crankcumferentiallyuwelded to an end of said wall to shafthaving a throw arm which is bodily insertform a hermetically sealed continuation thereof. 20

able through one of said supports, a removable 16. The combination set forth in claim 14 furcrankshaft bearing in said support through which ther characterized by the provision of a similar said crankshaft is inserted, a bearing in the cup-shaped end enclosure for the other end of other of said supports for also journalling said said frame.l Y u crankshaft, the crank throw being disposed be- 17. The combination set 'forth in claim 14 fur- 25 tween said bearing supports, a motor stator in ther characterized in that said end cover forms axial alignment with said wall, means for operan oil sump, and a lubricating pump supported atively supporting said 'stator by said frame infrom or oi' said supports so as to axially project dependently of said bearing supports, and an freely-therefrom and have communication with armature secured to said crankshaft. said sump. 30,

l5. A motor-compressor unit cmprising an integral compressor framehaving an axially excsarrrrcira ."Patent y'bio 2,113 ,6;9-1..

- tending wall which completely encircles the axis thereof to form a portion of the outermost wall ',o the unit, a cylinder formed. integrally with said wall and extending radiallyv thereof, a pair HENRY C. KELLER.

It is hereby' certified that errer appears-infami? pirintafiapecirreatrbn of the aboye nunbcred patent requiring corocftonnsfollows Page 6;;secondf columnrineis 21 and claimsPIL-fza'iit 1T :cespoefiifaeliy?,foxitliieolliaiiaref-l arance mehr *1mi reso 115; tutti. characters' Patint Should bb. read "with thiscorrectiontherein thatthc Ysapneinay confor-n to the record or the ensei in piraterie 'offresi' vl Y s, signeaand assied :magistratirainurp. 1953;@

chamber head for normally holding said liner and valve cage in immovable position.

13. The combination set forth in claim 10 -further characterized by the provision of a head se- 5 cured 'to the chamber housing, a cylinder liner of bearing supports projecting radially inwardly 5 linsertable within said cylinder through said from said wall and integral therewith, a crankchamber, a valve cage and mechanism mounted shaft having a throw arm which is bodily inserton the outer end of said cylinder liner, a spring able through one otfsaid supports, a'removable interposedbetween said valve cage and chamber crankshaft bearing in' said support through which l head for normally holding said liner and valve said crankshaft is inserted, a bearing in the 10 cage in immovable position, and means forming other of said supports for also journalling said a discharge outletfrom said chamber. crankshaft with the crank throw disposed mail? 14. A motor-compressor unit comprising an inbetween said bearing supports, a motor stator in tegral compressor frame having an axially exv axial alignment with saidwall, means for operl tending wall which completely encircles the com- `atively supporting said stator 'by said frame in l5 pressor axis, a cylinder formed integrally with dependently of said bearing supports, an arma-v said wall and extending radially thereof, a pair ture secured to said crankshaft, and a lower cup- `of bearing supports projecting radially inwardly shaped enclosure member seated upon and cir-l from said wall and integral therewith, a crankcumferentiallyuwelded to an end of said wall to shafthaving a throw arm which is bodily insertform a hermetically sealed continuation thereof. 20

able through one of said supports, a removable 16. The combination set forth in claim 14 furcrankshaft bearing in said support through which ther characterized by the provision of a similar said crankshaft is inserted, a bearing in the cup-shaped end enclosure for the other end of other of said supports for also journalling said said frame.l Y u crankshaft, the crank throw being disposed be- 17. The combination set 'forth in claim 14 fur- 25 tween said bearing supports, a motor stator in ther characterized in that said end cover forms axial alignment with said wall, means for operan oil sump, and a lubricating pump supported atively supporting said 'stator by said frame infrom or oi' said supports so as to axially project dependently of said bearing supports, and an freely-therefrom and have communication with armature secured to said crankshaft. said sump. 30,

l5. A motor-compressor unit cmprising an integral compressor framehaving an axially excsarrrrcira ."Patent y'bio 2,113 ,6;9-1..

- tending wall which completely encircles the axis thereof to form a portion of the outermost wall ',o the unit, a cylinder formed. integrally with said wall and extending radiallyv thereof, a pair HENRY C. KELLER.

It is hereby' certified that errer appears-infami? pirintafiapecirreatrbn of the aboye nunbcred patent requiring corocftonnsfollows Page 6;;secondf columnrineis 21 and claimsPIL-fza'iit 1T :cespoefiifaeliy?,foxitliieolliaiiaref-l arance mehr *1mi reso 115; tutti. characters' Patint Should bb. read "with thiscorrectiontherein thatthc Ysapneinay confor-n to the record or the ensei in piraterie 'offresi' vl Y s, signeaand assied :magistratirainurp. 1953;@ 

